Card X-10: SECOND HALVING – At block 420,000 the reward halves for the second time, from 25 to 12.5 bitcoin. Exactly three quarters of all bitcoin that will ever exist are now out in the world: 15.75 of 21 million. The last quarter will take more than a hundred years.

Anniversary · 9 July · THE CHRONICLE

At block 420,000 the reward halves for the second time, from 25 to 12.5 bitcoin. Exactly three quarters of all bitcoin that will ever exist are now out in the world: 15.75 of 21 million. The last quarter will take more than a hundred years.

SECOND HALVING · BLOCK 420.000 · 09.07.2016

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Source

Fact · Block 420,000, 2016-07-09 16:46:13 UTC (mempool.space); amount: 210,000 × 50 + 210,000 × 25 = 15,750,000 BTC = 75 % of 21 million; last issuance around the year 2140 (Bitcoin Core, GetBlockSubsidy)

Open source · mempool.space ↗

The question on the back

How much have you truly learned since the last halving?